---
title: What is a cover test?
description: "A cover test is a simple examination used to check how well your eyes work together. ## What happens during a cover test The clinician covers and uncovers each eye while you look at a target. Any movement of the…"
url: "https://bluefinvision.com/knowledge-base/topics/diagnostics-testing/what-is-a-cover-test/"
updated: "2025-12-31"
category: "Diagnostics & Testing"
---

# What is a cover test?

A cover test is a simple examination used to check how well your eyes work together.

## What happens during a cover test

The clinician covers and uncovers each eye while you look at a target. Any movement of the eyes helps reveal a hidden squint or problems with eye alignment.

- You focus on a letter or small picture across the room or up close
- One eye is covered while the other is observed carefully
- The process is repeated on the other eye and then alternating
- The test is painless and safe for adults and children

## Why a cover test matters

This test helps explain symptoms such as double vision, eyestrain, or headaches. Early detection of misalignment allows timely treatment and can protect comfortable, clear vision.

- Helps diagnose squints and small eye turns that are not obvious
- Guides decisions about glasses, prisms, or possible surgery
- Useful for monitoring children at risk of lazy eye
- Takes only a few minutes and can be repeated over time